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SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]            
Net income (loss) attributable to WESCO International, Inc. $ (34,506) $ 34,407 $ 63,464 $ 42,369 $ (100) $ 105,832
Weighted average common shares outstanding used in computing basic earnings per share (in shares) 42,683,000   43,493,000   42,260,000 44,280,000
Common shares issuable upon exercise of dilutive stock options (in shares) 92,000   323,000   152,000 381,000
Weighted average common shares outstanding and common share equivalents used in computing diluted earnings per share (in shares) 42,775,000   43,816,000   42,412,000 44,661,000
Weighted Average Number of Shares Outstanding, Basic and Diluted 42,683,000       42,260,000  
Earnings Per Share, Basic and Diluted [Abstract]            
Basic (in dollars per share) $ (0.84)   $ 1.46   $ (0.03) $ 2.39
Diluted (in dollars per share) $ (0.84)   $ 1.45   $ (0.03) $ 2.37
Net Income (Loss) Available to Common Stockholders, Basic $ (35,782)   $ 63,464   $ (1,376) $ 105,832